Dissertations / Theses on the topic 'Spiral Wound Module'
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El-Shamy, Awad. "Effect of permeate suction on the performance of spiral wound nanofiltration module." [Tampa, Fla.] : University of South Florida, 2009. http://digital.lib.usf.edu/?e14.2868.
Full textEl-Shamy, Awad Abdel Monem. "Effect of Permeate Suction on the Performance of Spiral Wound Nanofiltration Module." Scholar Commons, 2009. https://scholarcommons.usf.edu/etd/1949.
Full textHartinger, Martin [Verfasser]. "Milk protein fractionation by spiral-wound membranes - Optimization of process and module design / Martin Hartinger." München : Verlag Dr. Hut, 2021. http://d-nb.info/1235279413/34.
Full textFimbres, Weihs Gustavo Adolfo UNESCO Centre for Membrane Science & Technology Faculty of Engineering UNSW. "Numerical simulation studies of mass transfer under steady and unsteady fluid flow in two- and three-dimensional spacer-filled channels." Publisher:University of New South Wales. UNESCO Centre for Membrane Science & Technology, 2008. http://handle.unsw.edu.au/1959.4/41453.
Full textd’, Souza David. "Experimental Characterisation and Modelling of a Membrane Distillation Module Coupled to aFlat Plate Solar Collector Field." Thesis, Högskolan Dalarna, Energiteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:du-28186.
Full textChen, Kai. "Facilitated Transport Membranes for Fuel Utilization Enhancement for Solid Oxide Fuel Cells and Carbon Capture from Flue Gas." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595196886200366.
Full textAl-Obaidi, Mudhar A. A. R. "Modelling, Simulation, and Optimisation of Reverse Osmosis Process with Application in Wastewater Treatment and Food Processing." Thesis, University of Bradford, 2018. http://hdl.handle.net/10454/17345.
Full textMinistry of High Education and Scientific Research of Iraq
Wen, Tong. "Spirally wound electrodialysis (SpED) module." Thesis, Cranfield University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358252.
Full textIranshahi, Ashkan. "Static Mixing Spacers for Spiral Wound Modules." University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1352121892.
Full textBen, Boudinar Mourad. "Performance prediction and optimisation of spiral wound modules." Thesis, University of Glasgow, 1991. http://theses.gla.ac.uk/3235/.
Full textShi, Binchu. "Impacts of spiral-wound membrane modules in organic solvent nanofiltration applications." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/44570.
Full textRamasubramanian, Kartik. "CO2 (H2S)-SELECTIVE MEMBRANES FOR FUEL CELL HYDROGEN PURIFICATION AND FLUE GAS CARBON CAPTURE:AN EXPERIMENTAL AND PROCESS MODELING STUDY." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1374193903.
Full textWagner, Ole. "Modelling and simulation of transport phenomena in open channel spiral wound modules for seawater desalination /." Düsseldorf : VDI-Verl, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=015715135&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full textNjoki, Emmah. "Health promotion needs of youth with physical disabilities with specific reference to spinal cord injury in the Western Cape -- South Africa." Thesis, University of the Western Cape, 2004. http://etd.uwc.ac.za/index.php?module=etd&.
Full textChen, Ching-Liang, and 陳靖良. "Characterization of membrane fouling in spiral wound module using high frequency ultrasound image analyses." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/77441935156673258012.
Full text中原大學
化學工程研究所
100
The fouling phenomenon in spiral wound membrane modules was investigated using an ultrasonic time domain reflectometry (UTDR) and computational fluid dynamic (CFD). However, the UTDR with the lower frequency transducer has difficulty in analyzing the signals between inner and outer membrane surfaces of the same feed channel in spiral wound membrane modules. Purposes of this research were emphasized on the effects of the different membrane materials, placement types, operation time and feed velocity on the fouling phenomenon in spiral wound membrane modules. The results showed that the UTDR with the 50 MHz transducer had higher resolution so as to observe slight variation on the membrane surface. The fouling behavior was varied by the gravity and shear stress as the spiral wound membrane module set up horizontally. It was obviously understood differences between inner and outer membrane surface of the same feed channel owing to shear stress variations as the module set up vertically. As the membrane permeability of spiral wound membrane modules increased, the fouling area would be closed to the collection pipe. This tendency was agreed well with the CFD results. Therefore, the UTDR with high-frequency transducer could be used to analyze the slight variations of fouling phenomenon in spiral wound membrane modules.
Al-Obaidi, M. A., Chakib Kara-Zaitri, and Iqbal M. Mujtaba. "Simulation and optimisation of spiral-wound reverse osmosis process for the removal of N-nitrosamine from wastewater." 2018. http://hdl.handle.net/10454/15360.
Full textN-nitrosamine in wastewater treatment processes can contribute to several public health impacts including human carcinogens even at very low concentration. In this work, spiral-wound reverse osmosis (SWRO) process is used to remove N-nitrosamine compounds from wastewater. Effects of operating parameters of the SWRO process on the removal of N-nitrosamine, total water recovery, and specific energy consumption for a SWRO configurations are evaluated via simulation and optimisation. For this purpose, the one-dimensional distributed model developed earlier by the authors is modified by including different mass transfer coefficient correlation, temperature dependent water and solute permeability correlations and energy equations. The model is first validated by estimating a new set of model parameters using eight set of experimental data from the literature and is then used to simulate the process with and without energy recovery device to facilitate deeper insight of the effect of operating conditions on the process performance. The model is then embedded within an optimisation framework and optimisation problems to maximise N-nitrosamine rejections and to minimise specific energy consumption are formulated and solved while the operating conditions are optimized simultaneously.
Al-Obaidi, M. A., Chakib Kara-Zaitri, and Iqbal M. Mujtaba. "Significant energy savings by optimising membrane design in multi-stage reverse osmosis wastewater treatment process." 2017. http://hdl.handle.net/10454/14582.
Full textThe total energy consumption of many Reverse Osmosis (RO) plants has continuously improved as a result of manufacturing highly impermeable membranes in addition to implementing energy recovery devices. The total energy consumption of the RO process contributes significantly to the total cost of water treatment. Therefore any way of keeping the energy consumption to a minimum is highly desirable but continues to be a real challenge in practice. Potential areas to explore for achieving this include the possibility of optimising the module design parameters and/or the associated operating parameters. This research focuses on this precise aim by evaluating the impact of the design characteristics of membrane length, width, and feed channel height on the total energy consumption for two selected pilot-plant RO process configurations for the removal of chlorophenol from wastewater. The proposed two configurations, with and without an energy recovery device (ERD), consist of four cylindrical pressure vessels connected in series and stuffed with spiral wound membranes. A detailed steady-state model developed earlier by the authors is used here to study such impact via repetitive simulation. The results achieved confirm that the overall energy consumption can be reduced by actually increasing the membrane width with a simultaneous reduction of membrane length at constant membrane area and module volume. Energy savings of more than 60% and 54% have been achieved for the two configurations with and without ERD respectively using process optimization. The energy savings are significantly higher compared to other available similar studies from the literature.
Al-Obaidi, M. A., Chakib Kara-Zaitri, and Iqbal M. Mujtaba. "Simulation and sensitivity analysis of spiral wound reverse osmosis process for the removal of dimethylphenol from wastewater using 2-D dynamic model." 2018. http://hdl.handle.net/10454/16181.
Full textReverse Osmosis (RO) processes are readily used for removing pollutants, such as dimethylphenol from wastewater. A number of operating parameters must be controlled within the process constraints to achieve an efficient removal of such pollutants. Understanding the process dynamics is absolutely essential and is a pre-step for designing any effective controllers for any process. In this work, a detailed distributed two-dimensional dynamic (x and y dimensions and time) model for a spiral-wound RO process is developed extending the 2-D steady state model of the authors published earlier. The model is used to capture the dynamics of the RO process for the removal of dimethylphenol from wastewater. The performance of the 2-D model is compared with that obtained using 1-D dynamic model before the model is being used to investigate the performance of the RO process for a range of operating conditions.
Al-Obaidi, M. A., A. A. Alsarayreh, A. M. Al-Hroub, S. Alsadaie, and Iqbal M. Mujtaba. "Performance analysis of a medium-sized industrial reverse osmosis brackish water desalination plant." 2018. http://hdl.handle.net/10454/16400.
Full textThe implementation of Reverse Osmosis (RO) technology is noticeably increased to produce freshwater from brackish and seawater resources. In this work, performance analysis of a multistage multi pass medium-sized spiral wound brackish water RO (BWRO) desalination plant (1200 m³/day) of Arab Potash Company (APC) located in Jordan is evaluated using modelling and simulation. For this purpose, a mathematical model for the spiral wound RO process based on the principles of solution diffusion model is developed. The model is then used to simulate the operating conditions of low-salinity brackish water RO (BWRO) desalination plant. The results obtained are then compared against the real industrial data of BWRO desalination plant of APC which shows a high-level of consistency. Finally, the model is used to analysis the impact of the operating parameters such as salinity, pressure, temperature, and flow rate on the plant performance. The sensitivity analysis confirms that both feed flow rate and operating pressure as the critical parameters that positively affect the product salinity.
Siebdrath, Nadine. "Biofouling of membrane systems: characterization and impact of pre-treatment." Doctoral thesis, 2016. https://tud.qucosa.de/id/qucosa%3A30396.
Full textLi, Yu-Ling, and 李雨霖. "Hydrodynamics Analysis on Fluid Flow through Spiral Wound Membrane Modules." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/79466064323304805195.
Full text中原大學
化學工程研究所
90
Effect of spacer design on fluid flow and separation efficiency in a spiral-wound module was conducted using computational fluid dynamic (CFD) technique. The spacer serves both as mechanical stabilizer for channel geometry and turbulence promoters for reducing polarization phenomena near the membrane surface. The turbulence promotion is based upon the flow around the woven threads of the spacer. Previously, several factors affect the pressure drop and mass transfer in a spacer-filled spiral-wound module have been studied based upon flat channel module. However, the curvature of the spacer varies along the spiral flow path. No any effort has been placed on the effects of curvature of the spacer and membrane permeability in the spiral-wound modules on the pressure drop, shear rate and separation efficiency through the curved module. Purposes of this study were emphasized on the effects of curvature of the spacer, fiber arrangement and membrane permeability in the spiral-wound modules on the pressure drop, shear rate and separation efficiency through the modules. Results showed that increase of the curvature of the spacer will result in increases of both the pressure drop and shear rate. On the other hand, the curved spacer in a spiral wound module causes unequal strain rate at inner and outer membrane surfaces. Such unequal shear rates at the inner and outer surfaces would be expected to have an adverse impact on the membrane module performance because of different fouling characteristics for adjacent membrane leaves. Results showed that decreasing of the diameter of outer fiber or increasing of the permeability of inner membrane can improve this adverse impact.
Lu, Ming-Yang, and 呂明洋. "The Effects of Curvature on Fluid Flow through Spiral-Wound Membrane Modules." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/4cauxx.
Full text中原大學
化學工程研究所
93
The feed spacer serves both as mechanical stabilizer for channel geometry and turbulence promoters for reducing polarization phenomena near the membrane surface. The turbulence promotion is based upon the flow around the woven threads of the spacer. In previous studies, factors affect the pressure drop and mass transfer in a spacer-filled spiral-wound module have been studied based upon flat channel module. However, the curvature of the spacer and channel varies along the spiral flow path. No effort has been placed on the effects of curvature of the spacer and channel in the spiral-wound modules on the pressure drop, flux and separation efficiency through the curved module. Purposes of this work were emphasized on the effects of curvature of the spacer, fiber arrangement and the channel in the spiral-wound modules on the pressure drop, flux and separation efficiency through the modules. Results showed that increase of the curvature of the module will result in an increase of flux. The curved module in a spiral wound module causes unequal flux between inner and outer membrane layers. Such unequal flux through the inner and outer layers would be expected to have an unfavorable impact on the membrane module performance because of different fouling characteristics between each sides. An improvement analysis showed that decrease of the diameter of outer fiber or increase of the diameter of inner fiber can improve this adverse impact.
"The performance of neurophysiologic monitoring to predict postoperative deficits in a porcine model of spinal cord injury." Thesis, 2010. http://library.cuhk.edu.hk/record=b6075031.
Full textDuring stable anesthesia, experiments were completed in 31 pigs. A decrease in SEP amplitude > 25% and / or TceMEP amplitude > 65% was associated with substantial risk of postoperative motor deficit. In addition, rapid deterioration of signal within 5 min of an event, and / or a lack of signal recovery within 30 min after the initial deterioration were also predictors of postoperative paraplegia or weakness. These findings also correlated well with radiological changes in the spinal cord. The sensitivity and specificity for TceMEP to predict adverse neurologic outcome were 100% and 90.5%, respectively.
In a porcine model of direct compression and distraction of the exposed spinal cord, we measured the perioperative changes in SEP and TceMEP. This was correlated with postoperative motor function using the modified Tarlov scale. Magnetic resonance diffusion tensor imaging of the spinal cord was also performed to assess the anatomical extent of injury three days after surgery.
The spinal cord is at risk of injury during complex operations of the spine or aorta, and may result in catastrophic long term disability. Intraoperative monitoring with somatosensory evoked potential (SEP) and transcranial electric motor evoked potential (TceMEP) are commonly performed to assess the integrity of the sensory and motor pathways, respectively. The purpose of this study was to identify the minimum changes in signal amplitudes, beyond which postoperative neurologic deficit may occur.
Liu, Quanmeng.
Adviser: Matthew Tu Chan.
Source: Dissertation Abstracts International, Volume: 73-02, Section: B, page: .
Thesis (Ph.D.)--Chinese University of Hong Kong, 2010.
Includes bibliographical references (leaves 87-103).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstract also in Chinese.
Walker, Chandler L. "Targeting acute phosphatase PTEN inhibition and investigation of a novel combination treatment with Schwann cell transplantation to promote spinal cord injury repair in rats." Thesis, 2014. http://hdl.handle.net/1805/4210.
Full textHuman traumatic spinal cord injuries (SCI) are primarily incomplete contusion or compression injuries at the cervical spinal level, causing immediate local tissue damage and a range of potential functional deficits. Secondary damage exacerbates initial mechanical trauma and contributes to function loss through delayed cell death mechanisms such as apoptosis and autophagy. As such, understanding the dynamics of cervical SCI and related intracellular signaling and death mechanisms is essential. Through behavior, Western blot, and histological analyses, alterations in phosphatase and tensin homolog (PTEN)/phosphatidylinositol-3-kinase (PI3K) signaling and the neuroprotective, functional, and mechanistic effects of administering the protein tyrosine phosphatase (PTP) inhibitor, potassium bisperoxo (picolinato) vanadium ([bpV[pic]) were analyzed following cervical spinal cord injury in rats. Furthermore, these studies investigated the combination of subacute Schwann cell transplantation with acute bpV(pic) treatment to identify any potential additive or synergistic benefits. Although spinal SC transplantation is well-studied, its use in combination with other therapies is necessary to complement its known protective and growth promoting characteristics. v The results showed 400 μg/kg/day bpV(pic) promoted significant tissue sparing, lesion reduction, and recovery of forelimb function post-SCI. To further clarify the mechanism of action of bpV(pic) on spinal neurons, we treated injured spinal neurons in vitro with 100 nM bpV(pic) and confirmed its neurprotection and action through inhibition of PTEN and promotion of PI3K/Akt/mammalian target of rapamycin (mTOR) signaling. Following bpV(pic) treatment and green fluorescent protein (GFP)-SC transplantation, similar results in neuroprotective benefits were observed. GFP-SCs alone exhibited less robust effects in this regard, but promoted significant ingrowth of axons, as well as vasculature, over 10 weeks post-transplantation. All treatments showed similar effects in forelimb function recovery, although the bpV and combination treatments were the only to show statistical significance over non-treated injury. In the following chapters, the research presented contributes further understanding of cellular responses following cervical hemi-contusion SCI, and the beneficial effects of bpV(pic) and SC transplantation therapies alone and in combination. In conclusion, this work provides a thorough overview of pathology and cell- and signal-specific mechanisms of survival and repair in a clinically relevant rodent SCI model.